AMD
SWITCHING CHARACTERISTICS over COMMERCIAL operating ranges (Note 1)
Parameter
Symbol
Parameter Description
Min
Max
Unit
tPD
Input or Feedback to Combinatorial Output
16L8, 16R6,
16R4
35
ns
tS
tH
Setup Time from Input or Feedback to Clock
Hold Time
35
0
ns
ns
tCO
tWL
tWH
Clock to Output or Feedback
16R8, 16R6,
16R4
25
ns
Clock Width
LOW
25
25
16
ns
HIGH
ns
Maximum
Frequency
(Note 2)
External Feedback
1/(tS + tCO
)
MHz
fMAX
No Feedback
1/(tWH + tWL
)
20
MHz
ns
tPZX
tPXZ
tEA
OE to Output Enable
OE to Output Disable
25
25
35
35
ns
Input to Output Enable Using Product Term Control
Input to Output Disable Using Product Term Control
16L8, 16R6,
16R4
ns
tER
ns
Notes:
1. See Switching Test Circuit for test conditions.
2. These parameters are not 100% tested, but are calculated at initial characterization and at any time the design is modified
where frequency may be affected.
2-27
PAL16R8B-4 (Com’l)
AMD [ AMD ]
